Year	Number
1996	1.26643979549408
1998	1.2458621263504
2000	1.22314357757568
2002	1.42246282100677
2003	1.4146842956543
2004	1.41426146030426
2005	1.35916078090668
2006	1.3497759103775
2007	1.37826728820801
2008	1.39858841896057
2009	1.40567350387573
2010	1.38942682743073
2011	1.61142528057098
2012	1.56186008453369
2013	1.5587409734726
2014	0.880748271942139
2015	0.898378431797028
2016	0.860476732254028
2017	1.1999214887619
2018	1.18732905387878
2019	1.22192621231079
2020	1.33542132377625
2021	1.35934960842133
2022	1.39833402633667